The 2015 debut of Bridgestone's asymmetric front tyre at the Sachsenring this weekend highlights what championship leader Valentino Rossi believes will be one of the key decisions for the race.

The asymmetric front, which in the case of the Sachsenring features softer rubber on the right side, was first used at Phillip Island last year - when several front-running riders fell without warning in the cool and windy race.

"I think that for this weekend the front tyre choice can be a key for the race," Rossi said on Thursday. "In fact Bridgestone bring a lot of front tyres, because they want to be sure and safe for all the range of temperatures during the weekend.

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"I think this track is the most difficult for the front tyre together with Phillip Island. In Phillip Island we had the asymmetric front tyre but a lot of people had problems during the race.

"I spoke a lot with Bridgestone and they are quite sure that this time at this track the asymmetric tyre can be a help. This is just an idea, we have to wait for tomorrow, try the tyre and understand if it can bring some advantage compared to the normal one.

The unusual tyre choice reflects an unusual circuit layout.

"You know this track is a little bit different compared to the others. It is very tricky, small and 80% on the left so it is a little bit like a flat track oval!" Rossi explained. "You have to ride in another way because of the very long corners and everything is always difficult.

"Last year it was quite a bad race because I wasn't fast enough, especially in the race. because it was difficult conditions between wet and dry and I wasn't strong enough to arrive on the podium. Here the weather conditions are always difficult so we will try to be ready for all the conditions."

Rossi takes a ten point lead over Yamaha team-mate Jorge Lorenzo into the event, which will mark the midway point of the 2015 season and last round before the summer break.

"It is very important to keep the concentration at 100% until Sunday and after think about the holidays."